| 摘要 |
A vehicle frame assembly (4) which includes an interface portion (10) hav ing first and second mounting regions for releasably mounting on the assembl y (4), one behind the other, respective first and second child-carrying unit s (12) in an echelon formation upwardly relative to the assembly (4) wherein the interface portion (10) is a sub- fame assembly detachably connected to the frame assembly (4).
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